1939 special delivery air-mail letter to New York, franked with. forerunner airmail stamp 10CZK, Pof.L13, special postmark BRATISLAVA 1/ 20. ROKOVSLOV. KNIHY/ 20.III.39, transit PARIS AVIATION/ 24.III.39; c.v.. Földes usage L13 rates 5.000Sk, extraordinary entire!